[regexp] back refs must not start/end in the middle of a surrogate pair

src/regexp/jsregexp.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_REGEXP_JSREGEXP_H_
 #define V8_REGEXP_JSREGEXP_H_
 
 #include "src/allocation.h"
 #include "src/assembler.h"
 #include "src/regexp/regexp-ast.h"
+#include "src/regexp/regexp-macro-assembler.h"
 
 namespace v8 {
 namespace internal {
 
 class NodeVisitor;
 class RegExpCompiler;
 class RegExpMacroAssembler;
 class RegExpNode;
 class RegExpTree;
 class BoyerMooreLookahead;
 
-
-static const uc32 kLeadSurrogateStart = 0xd800;
-static const uc32 kLeadSurrogateEnd = 0xdbff;
-static const uc32 kTrailSurrogateStart = 0xdc00;
-static const uc32 kTrailSurrogateEnd = 0xdfff;
-static const uc32 kNonBmpStart = 0x10000;
-static const uc32 kNonBmpEnd = 0x10ffff;
-
-
 class RegExpImpl {
  public:
   // Whether V8 is compiled with native regexp support or not.
   static bool UsesNativeRegExp() {
 #ifdef V8_INTERPRETED_REGEXP
     return false;
 #else
     return true;
 #endif
   }
@@ skipping 1547 matching lines @@
   static const int kStringOffset = 0;
   static const int kPatternOffset = 1;
   static const int kArrayOffset = 2;
   static const int kLastMatchOffset = 3;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_REGEXP_JSREGEXP_H_